Simulation of Nanoparticle Production in Premixed Aerosol Flow Reactors by Interfacing Fluid Mechanics and Particle Dynamics

Authors: Schild, A.1; Gutsch, A.1; Mühlenweg, H.1; Pratsinis, S.E.2

Source: Journal of Nanoparticle Research, Volume 1, Number 2, 1999 , pp. 305-315(11)

Publisher: Springer

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The interaction of fluid mechanics and particle dynamics at the very early stages of flame synthesis largely affects the characteristics of the product powder. Detailed simulations provide a better understanding of these processes, which take place in a few milliseconds, and offer the possibility to influence the product characteristics by intelligent selection of the process parameters. The present paper reports on the simulation of titania powder formation by TiCl_4 oxidation in an aerosol flow reactor. A commercially available fluid mechanics code is used for the detailed calculation of the fluid flow and the chemical reaction at non-isothermal conditions. This code is then interfaced with a model for aggregate particle dynamics neglecting the spread of the particle size distribution. The simulation shows the onset of the particle formation in the reactor and calculates the dynamic evolution of the aggregate particle size, number of primary particles per aggregate and the specific surface area throughout the reactor. The presented, newly developed calculation technique allows for the first time the simulation of particle formation processes under the authentic, complex conditions as found in actual aerosol reactors.

Keywords: CFD; flame synthesized aerosols; fluid mechanics; modeling; particle population

Document Type: Regular Paper

Affiliations: 1: Degussa-Hüls AG, Rodenbacher Chaussee 4, 63403 Hanau, Germany 2: Swiss Federal Institute of Technology (ETH), Institute of Process Engineering (IVUK), ETH Zentrum, ML F26, 8092 Zürich, Switzerland

Publication date: January 1, 1999

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